"My mother"

Shane woke up on the sofa of his living room. "Weird", he thought. He had expected to arrive in his mom's body wherever (and whenever) he had left it. But now the house was so quiet.

"How much time has passed?", he asked himself. When he looked down, he could see the answer for himself. He screamed. "What the hell?? I'm 9 months pregnant?!"

Shane had no clue of the other things that had changed in the meantime.
His sister (now daughter) had left the house right after he was caught fucking her boyfriend.
His father (now husband) had divorced his mother right away and when it came out that she was pregnant from her sister's ex-boyfriend, he had fled also.

Shane cried. This was a mess... He ruined the lives of his family and he would have to give birth to his own bastard sister or brother!
"Hush now, little one", he heard someone say. He looked up and saw himself, well now Merlin in his body. "I know this is hard, but you will get through this, I will help you", he said.
"Things will get better, you'll see."

And with those words, Shane started his life as his own mother. (And also fun to point out, right after those words he went into labour. So his new life litteraly started with a bang.)